The build years of the donar and reciepient are relavant. If both are turbo almost anything other than the the engine if required for the td as the td has a pump in the engine head.

You would have to switch heads to drop an engine into a td. Of course any sheet metal differences unless you can post a td with a trunk lid on it or conversly a sedan with a tailgate.

There may be some rear end ratio differences and some speedometer drive differences as well. Again other than those areas most parts should be interchangeable. The td has a hydro self leveling system in the rear as well. The closer they are in build years the better I imagine.

As one poster stated mention what you are thinking about doing. We have a lot of members that know these cars inside out remember.